PORSCHE RACING HISTORY1971 - Can-Am Donnybrooke
12 September 1971 - Donnybrooke International Speedway, USA
Jo Siffert 5th in a Porsche 917/10
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 20 | Porsche 917/10 | 917/10-002 | Jo Siffert (CH) | STP Porsche Audi | 5th | 8th | 69 laps | ||
| 0 | Porsche 917 PA | 917-028 | Milt Minter (USA) | Vasek Polak Racing | 7th | 10th | 67 laps | ||
| 87 | Porsche 908/02 | 908/02-015 | Steve Matchett (USA) | A. G. Dean | 11th | 17th | 62 laps |
Can-Am - Canadian-American Challenge Cup
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